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We're all used to sending emails with subject lines. It lets the receiver know what the email is about, which increases the odds they'll read it, and it makes it easier to keep track of multiple email exchanges on the same topic. It turns out you can also add subject lines to text messages and iMessages sent from your iPhone—which can be especially handy if you know you'll want to refer back to the conversation at a later time, since you can easily search for the message's subject. Here's how you can turn this feature on:

What do you do if you have $180 billion in cash? If you're Apple, you develop a car. A number of reports in recent days have said that Apple is working on a design for an electric car and that it's expected to have self-driving features.

My daughter is participating in the American Heart Association Jumprope for Heart program. To prepare, I've had her try the VERT Jump Tracking Device ($124.99). While it's meant for professional and serious athletes, it gave her the feedback and encouragement needed to keep working. The VERT is a belt-clip wearable that's made in the U.S. and if you don't have an outfit that accommodates a belt-clip, they include an elastic belt as an option.

Groucho Marx used to say "Live every day as if it were your last, because one day, you're going to be right." Likewise, Piper Jaffray's Gene Muster is always proclaiming that "this year" is the year Apple will ship its own full-size Apple TV and not just a hockey puck-sized set-top box. He still thinks a full-fledged television is coming from Apple, but in the meantime, an updated Apple TV should ship in 2015. That is a safer bet (and a far safer one than Apple shipping an automobile.)

Whenever Apple releases a new major version of iOS, it sends developers scrambling. They have to make sure their apps are compatible and aren't relying on "deprecated" code that no longer works or will stop working soon. But sometimes Apple changes things just enough in ways that don't break an app, but have an impact nonetheless. Twitter has just found this out the hard way.

The other day, I was about to head out on the trails for my annual attempt at completing a couch-to-5K program, when I realized that my iPhone battery was almost out of juice. I didn't want to risk having my phone die while I was out on the relatively deserted trails (what if I got attacked by angry squirrels and needed to call for help?) And I needed to leave the house soon or I wouldn't be able to complete the workout before sunset.

Apple has worked hard to make sure you can do everything from your iPhone and iPad without having to connect it to your desktop computer. Over-the-air system updates and backups via WiFi were a culminating step in this direction. In addition, you can also now manage your Apple ID account from your iPhone or iPad.

Thanks to iCloud, you can create things like shopping lists or to-do lists in Reminders at home on your iPad and then access and edit those lists on your iPhone while you're out running errands or shopping. But what if you want someone else to have a copy of the list on his or her device and you don't want to use the Family Sharing Reminders list or that person's not part of your Family? Here's how you can share your shopping list with another person using iCloud.

Once again, Apple watchers (not to be confused with Apple Watches) are getting giddy about the concept of an Apple car. Every so often this prospect gets some traction, in part because of Steve Jobs and Jony Ive's appreciation for cars. There was some work with Volkswagon, dubbed the iBeetle, but that was more of a branding promotion. The reason people think Apple might be making its own car, now, is that they have been trying to poach employees from Tesla. This is hardly a reason to draw such conclusions, however.